<template>
  <div class="home-category">
    <ul class="menu">
      <li
        :class="{ active: categoryId === item.id }"
        v-for="item in menuList"
        :key="item.id"
        @mouseenter="categoryId = item.id"
      >
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink
            v-for="sub in item.children"
            :key="sub.id"
            :to="`/category/sub/${sub.id}`"
          >
            {{ sub.name }}
          </RouterLink>
        </template>
        <span v-else>
          <XtxSkeleton
            width="60px"
            height="18px"
            style="margin-right: 5px"
            bg="rgba(255,255,255,0.2)"
          />
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
        </span>
      </li>
    </ul>

    <!-- 弹层 -->
    <div class="layer">
      <h4 v-if="currCategory">
        {{ currCategory.id === "brand" ? "品牌" : "分类" }}推荐
        <small>根据您的购买或浏览记录推荐</small>
      </h4>
      <ul
        v-if="currCategory && currCategory.goods && currCategory.goods.length"
      >
        <li v-for="item in currCategory.goods" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" alt="" />
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price"><i>¥</i>{{ item.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <ul
        v-if="currCategory && currCategory.brands && currCategory.brands.length"
      >
        <li class="brand" v-for="item in currCategory.brands" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" alt="" />
            <div class="info">
              <p class="place">
                <i class="iconfont icon-dingwei"></i>{{ item.place }}
              </p>
              <p class="name ellipsis">{{ item.name }}</p>
              <p class="desc ellipsis-2">{{ item.desc }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import { useStore } from "vuex";
import { reactive, computed, ref } from "vue";
import { findBrand } from "@/api/home.js";
export default {
  name: "HomeCategory",
  // 1. 获取vuex的一级分类，并且只需要两个二级分类
  // 2. 需要在组件内部，定义一个品牌数据
  // 3. 根据vuex的分类数据和组件中定义品牌数据，得到左侧分类完整数据(9分类+1品牌)数组
  // 4. 进行渲染即可

  setup() {
    const categoryId = ref(null);
    const brand = reactive({
      id: "brand",
      name: "品牌",
      children: [{ id: "brand-chilren", name: "品牌推荐" }],
      brands: [],
    });
    findBrand().then((data) => {
      brand.brands = data.result.splice(0, 6);
    });

    const store = useStore();
    const menuList = computed(() => {
      const list = store.state.category.list.map((item) => {
        return {
          id: item.id,
          name: item.name,
          // 防止初始化没有children的时候调用slice函数报错
          children: item.children && item.children.slice(0, 2),
          goods: item.goods,
        };
      });
      list.push(brand);
      return list;
    });

    // 获取当前分类逻辑
    const currCategory = computed(() => {
      console.log(categoryId);
      return menuList.value.find((item) => item.id === categoryId.value);
    });
    return { menuList, categoryId, currCategory };
  },
};
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;

      li.brand {
        height: 180px;
        a {
          align-items: flex-start;
          img {
            width: 120px;
            height: 160px;
          }
          .info {
            p {
              margin-top: 8px;
            }
            .place {
              color: #999;
            }
          }
        }
      }
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
      .xtx-skeleton {
        animation: fade 1s linear infinite alternate;
      }
      @keyframes fade {
        from {
          opacity: 0.2;
        }
        to {
          opacity: 1;
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
  .xtx-skeleton {
    animation: fade 1s linear infinite alternate;
  }
  @keyframes fade {
    from {
      opacity: 0.2;
    }
    to {
      opacity: 1;
    }
  }
}
</style>